dropped three giant cement slabs, causing major delays. >> i'm supposed to be at home, my work at 7:30. >> reporter: the slow start had a lot of drivers visibly frustrated. a flatbed headed to herndon with three concrete slabs, each weighing about 10,000 pounds, ended up in the road when the driver says someone pulled out in front of him. >> when it happened, i tried to see what happened with the guy, he run, he never stop. >> reporter: the driver of the car did not stay, but for the better part of two hours, the concrete slabs used for building construction sat there on route 123 as a crane operator, police, and the driver worked to get it cleaned up. police told me there's a lot of truck traffic in the area, and random inspection showing major issues with safety are concerning. >> just check every day before i left. >> reporter: the load was eventually cleaned up, but not without derailing morning plans. >> yeah, going to work right now, and i'm running late, about 30 minutes, which i have to call and let them know.